What if the Captains could have used their Bankai during the First Quincy Invasion?

If they could have used their Bankai during the First Invasion would it have changed the outcome of the battles? Would the Soul Reapers have been able to Repel or Beaten the Quincies?

If they could have used their Bankai during the First Invasion would it have changed the outcome of the battles? Would the Soul Reapers have been able to Repel or Beaten the Quincies?